#!/bin/bash

#
# /Users/Shared/bin/share-itunes
#
# Fixes iTunes library permissions to allow sharing between all
# users that store their music in the shared directory.
#


##### Constants

# location of the shared music library
readonly LIBRARY='/Users/Shared/Music/iTunes/'

readonly ROOT_UID=0               # users with $UID 0 have root privileges
readonly PROGNAME=$(basename $0)  # name of this script for error output
readonly E_NOTROOT=67             # non-root exit error


##### Functions

function error_exit {
	echo "${PROGNAME}: ${1:-"Unknown Error"}" 1>&2
	exit 1
}


##### Main

# ensure user has root privileges
if [ "$UID" -ne "$ROOT_UID" ]; then
	echo "Permission denied: You must be root to run this script.";
	exit $E_NOTROOT
fi

# ensure destination directory exists
if [ ! -d "$LIBRARY" ]; then
	error_exit "Specified library $LIBRARY does not exist.";
fi

# change the file permissions of new music from 640 to 644
find $LIBRARY -type f -perm 640 -regex ".*\.m4[pa]" -exec chmod 644 {} \;

exit 0

# End of file